Tracing logging user input may result in poisoning logs with ANSI escape sequences

### Impact Previous versions of tracing-subscriber were vulnerable to ANSI escape sequence injection attacks. Untrusted user input containing ANSI escape sequences could be injected into terminal output when logged, potentially allowing attackers to: - Manipulate terminal title bars - Clear screens or modify terminal display - Potentially mislead users through terminal manipulation In isolation, impact is minimal, however security issues have been found in terminal emulators that enabled an attacker to use ANSI escape sequences via logs to exploit vulnerabilities in the terminal emulator. ### Patches `tracing-subscriber` version 0.3.20 fixes this vulnerability by escaping ANSI control characters in when writing events to destinations that may be printed to the terminal. ### Workarounds Avoid printing logs to terminal emulators without escaping ANSI control sequences. ### References https://www.packetlabs.net/posts/weaponizing-ansi-escape-sequences/ ### Acknowledgments We would like to thank [zefr0x](http://github.com/zefr0x) who responsibly reported the issue at `[email protected]`. If you believe you have found a security vulnerability in any tokio-rs project, please email us at `[email protected]`.

Source published

29 Aug 2025 20:33:56 UTC

Source modified

10 Sep 2026 03:50:27 UTC

Observed here

24 Oct 2026 13:19:54 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Publisher rating · LOW